*{
    padding: 0;
    margin: 0;
    box-sizing: border-box;
}
ul,ol{
    list-style: none;
}
a,u{
    text-decoration: none;
}
b,strong{
    font-weight: 400;
}
i,em{
    font-style: normal;
}
h1,h2,h3,h4,h5,h6{
    font-weight: 400;
    font-size: 16px;
}
input{
    border: none;
    /* 轮廓线 */
    outline: none;
}
/* 万能清除法 */
.clearfix::after{
    content: " ";
    display: block;
    width: 0;
    height: 0;
    overflow: hidden;
    visibility: hidden;
    clear: both;
}